Cadotte, M.W., Cardinale, B.J. & Oakley, T.H. (2008) Evolutionary history and the effect of biodiversity on plant productivity. Proceedings of the National Academy of Sciences of the United States of America, 105, 17012–17017.

Mulder, C.P.H., Uliassi, D.D. & Doak, D.F. (2001) Physical stress and diversity-productivity relationships: the role of positive interactions. Proceedings of the National Academy of Sciences of the United States of America, 98, 6704–6708.